CVE-2026-4509Public exploitNetwork attack vector

Authenticated code execution via incomplete extension blacklist

Published Mar 21, 2026 · Updated Mar 21, 2026

Unrestricted file upload in PbootCMS 3.2.0 through 3.2.12 allows remote authenticated users to execute code through crafted filenames. The blacklist in core/function/file.php omits executable and configuration extensions such as .pht, .phar, .cgi, .htaccess, and .user.ini. A user with /member/upload access can place a crafted file in a web-accessible directory; code execution requires a server that interprets the chosen extension.

CVSS severity6.3

Medium

EPSS probability0.29%

Next 30 days · Sep 16, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

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Summary

What happened

The record

CVE: CVE-2026-4509
Published: Mar 21, 2026
Updated: Mar 21, 2026

Vendor: Zhejiang Zoneland Zongheng Network Technology Co., Ltd.
Product: PbootCMS
Classifications: CWE-184, CWE-183, T1190

Attack vector: network
Privileges: authenticated

Timeline

How it unfolded

Mar 21, 2026CVE publishedPublication date reported by the CVE source.
Mar 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

Affected versionversion=3.2.0
Affected versionversion=3.2.1
Affected versionversion=3.2.10
Affected versionversion=3.2.11
Affected versionversion=3.2.12
Affected versionversion=3.2.2
Affected versionversion=3.2.3
Affected versionversion=3.2.4
Affected versionversion=3.2.5
Affected versionversion=3.2.6
Affected versionversion=3.2.7
Affected versionversion=3.2.8
Affected versionversion=3.2.9

What conditions does exploitation require?

Attack vectornetwork

Required privilegesauthenticated

What is affected?

Zhejiang Zoneland Zongheng Network Technology Co., Ltd. · PbootCMSversion=3.2.0; version=3.2.1; version=3.2.10; version=3.2.11; version=3.2.12; version=3.2.2; version=3.2.3; version=3.2.4; version=3.2.5; version=3.2.6; version=3.2.7; version=3.2.8; version=3.2.9

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026

Latest reporting daySep 16, 2026

Latest daily unique IPsUnavailable

Prior 30-day averageUnavailable

SourceShadowserver honeypots (KEV)

Vectornetwork

Privilegesauthenticated

Known exploitationUnconfirmed

Public exploitPublished

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs

CWE-183Permissive List of Allowed Inputs

T1190Exploit Public-Facing Application

Public exploit references

PbootCMS dangerous file upload proof of conceptproof of concept · demonstrated

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

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